test/arp: Add ARP test

Checks that address learned by the host and target match and were also
learned by the correct network interface too.

Signed-off-by: Florian Fainelli <[email protected]>

tests/port/arp.py

@@ -0,0 +1,44 @@
+
+import unittest
+
+from dsatest.bench import bench
+
+class TestArp(unittest.TestCase):
+
+
+    def setUp(self):
+        links = bench.links
+        if len(links) == 0:
+            self.skipTest("Empty link list")
+
+        for i, l in enumerate(links, start=1):
+            l.host_if.flushAddresses()
+            l.target_if.flushAddresses()
+
+    def tearDown(self):
+        pass
+
+    def test_arp(self):
+        links = bench.links
+
+        for i, l in enumerate(links, start=1):
+            host_addr = "192.168.10.{}/24".format(str(i * 2))
+            target_addr = "192.168.10.{}/24".format(str(i * 2 + 1))
+
+            l.host_if.addAddress(host_addr)
+            l.target_if.addAddress(target_addr)
+
+            host_addr = "192.168.10.{}".format(str(i * 2))
+            target_addr = "192.168.10.{}".format(str(i * 2 + 1))
+
+            l.host_if.ping(target_addr, count=1, deadline=10)
+            ArpEntry reply = l.host_if.arp.get()
+            if reply.interface != l.host_if.name:
+                raise ValueError("Interface mismatch. Got {}, expected {}".
+                                format(reply.interface, l.host_if.name))
+            reply = l.target_if.arp.get()
+            if reply.interface != l.target_if.name:
+                raise ValueError("Interface mismatch. Got {}, expected {}".
+                                format(reply.interface, l.target_if.name))
+            l.host_if.flushAddresses()
+            l.target_if.flushAddresses()